排序方式: 共有9条查询结果,搜索用时 31 毫秒
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城市供水调度系统的现状与发展 总被引:4,自引:0,他引:4
简述国内城市供水调度系统的应用现状,指出在实际应用中存在的问题和解决的途径。并介绍了系统几年来的发展及今后的趋势。 相似文献
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余欣 《民用飞机设计与研究》2011,(4):1-4
介绍了制定民用飞机主最低设备清单(MMEL)的原因和MMEL的立项原则,阐述了MMEL评估报告的组成和MMEL论证部分的具体内容,并对各部分内容进行了详细说明;同时给出一个MMEL候选项目评估报告示例,并重点研究了MMEL候选项目的分析方法。 相似文献
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CM2主线圈结构设计是对结构尺寸精度要求很高,对使用材料有特殊要求的非标准结构设计。设计中充分考虑结构的稳定性和可靠性,围绕实现精度要求,根据使用材料的特性,制定了满足精度要求的工艺性、经济性较好的设计方案. 相似文献
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The navigation constellation will have the capability of supporting Tracking Telemetry and Command (TT&C) operations by inter-satellite link (ISL). The ISL will become an important solution to reduce the shortage of ground TT&C resources. The problems need to be studied urgently in the field of space TT&C network resources scheduling management are how to determine the availability of ISL and how to allocate TT&C resources of ISL. The performance and scheduling constraints of navigation constellation?s ISL are analyzed, and three utilization strategies of ISL to perform TT&C operations are proposed. The allocation of TT&C resources based on ISL falls into two successive phases. Firstly, master satellite determination equation is established by using 0–1 Programming model based on the availability matrix. Mathematical method is used to solve the equation to determine the master satellite and the topology of ISL. Secondly, Constraint Programming (CP) model is used to describe the ground TT&C resources scheduling problem with special requirements of TT&C operations based on master satellite, and a heuristic algorithm is designed to solve the CP model. The equations and algorithm are verified by simulation examples. The algorithm of TT&C resources scheduling based on ISL has realized the synthesized usage of both the ISL and ground resources on TT&C field. This algorithm can improve TT&C supports of territorial ground TT&C network for global navigation constellation, and provides technical reference for the TT&C mission planning of global constellation by using ISL. 相似文献
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当舰上的主导航系统与载机子惯导之间进行传递对准时,船体的变形会引起对准误差。想消除船体变形的影响从理论上讲,挠曲变形可以通过卡尔曼滤波进行估计,但在实际上很难建立足够精确的模型。通过船体变形的测量与校正技术,在大型载舰存在复杂动态变化的情况下,可采用分布式姿态基准,在载舰上的不同部位安装有限套惯性测量单元(IMU),与舰上主导航系统构建成一个惯导网络,为载机子惯导的传递对准提供更丰富、更准确的载舰状态信息,从而大大提高传递对准的精度的研究。 相似文献
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通过数字化导管加工与常规导管加工在协调方法、工艺过程、检测方法等方面对比分析,得出数字化导管制造可以缩短制造周期、降低生产成本的结论,能够适应现代飞机快速研制及改型需求,形成现代飞机导管制造核心竞争力。 相似文献
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